Another vote for the Nikon F3's MD4 & MN2 nicad combo. Sounds so crisp and very different to the sound made when running off of alkalines. My other two motor driven camera's, a Nikon FA /MD15 combo & a Nikon F5 don't even come close.

If you ever heard a Zeiss Ikon Contarex you know that very special shutter noise, it's a little bit like releasing 500 mechanic parts that are all under high tension, a little bit like a clockwork shooting a round like a battleship cannonade. Well, they made a motor drive for that camera to add more fun: